Bump parallel_tests from 3.1.0 to 3.2.0 (#14702)

Bump parallel_tests from 3.1.0 to 3.2.0 (#14702)

Bumps [parallel_tests](https://github.com/grosser/parallel_tests) from 3.1.0 to 3.2.0.
- [Release notes](https://github.com/grosser/parallel_tests/releases)
- [Changelog](https://github.com/grosser/parallel_tests/blob/master/CHANGELOG.md)
- [Commits](https://github.com/grosser/parallel_tests/compare/v3.1.0...v3.2.0)

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